The problem with those fuel lines is the plastic ends get very brittle with age. So you might push in the horseshoe, pull on the line, and have the end come apart on you. Then the car is undriveable until you're able to replace the line.

My first shutoff valve cracked right through the middle which was nearly impossible to track down until I removed it. Much more common is the O ring between the shutoff (black box) and the injection pump.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References